It seems like the Rb and H-maser clocks on the Galileo satellites might be experiencing a problem....
Here is a link to a BBC report:
http://www.bbc.co.uk/news/science-environment-38664225
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Thales UK Limited. A company registered in England and Wales. Registered Office: 2 Dashwood Lang Road, The Bourne Business Park, Addlestone, Weybridge, Surrey KT15 2NX. Registered Number: 868273